share-safe: enable by default (BC)

The feature have been around for a year (4 version) and is quite important.

Lets make it enabled by default.

Differential Revision: https://phab.mercurial-scm.org/D11997

mercurial/configitems.py

@@ -1375,7 +1375,7 b' coreconfigitem('
 coreconfigitem(
     b'format',
     b'use-share-safe',
-    default=False,
+    default=True,
 )
 coreconfigitem(
     b'format',

mercurial/helptext/config.txt

@@ -998,7 +998,7 b' https://www.mercurial-scm.org/wiki/Missi'
 
     Introduced in Mercurial 5.7.
 
-    Disabled by default.
+    Enabled by default in Mercurial 6.1.
 
 ``usestore``
     Enable or disable the "store" repository format which improves

mercurial/upgrade_utils/actions.py

@@ -243,7 +243,7 b' class sharesafe(requirementformatvariant'
     name = b'share-safe'
     _requirement = requirements.SHARESAFE_REQUIREMENT
 
-    default = False
+    default = True
 
     description = _(
         b'old shared repositories do not share source repository '

relnotes/next

@@ -4,7 +4,15 b''
 == Default Format Change ==
 
 These changes affects newly created repositories (or new clone) done with
-Mercurial XXX.
+Mercurial 6.1.
+
+The `share-safe` format variant is now enabled by default. It makes
+configuration and requirements more consistent across repository and their
+shares. This introduces a behavior change as shares from a repository using the
+new format will also use their main repository's configuration.
+
+See `hg help config.format.use-share-safe` for details about the feature and
+the available options for auto-upgrading existing shares.
 
 
 == New Experimental Features ==
@@ -29,6 +37,10 b' in conflicts while running `hg histedit`'
 "base", and "histedit". They are now "already edited",
 "parent of current change", and "current change", respectively.
 
+The use of `share-safe`, means shares (of new repositories) will also use their
+main repository's configuration see the `Default Format Change` section
+for details.
+
 == Internal API Changes ==
 
 The following functions have been removed:

tests/test-empty.t

@@ -25,9 +25,10 b' Check the basic files created:'
   store
   wcache
 
-Should be empty:
+Should be empty (except for the "basic" requires):
 
   $ ls .hg/store
+  requires
 
 Poke at a clone:
 
@@ -51,8 +52,9 b' Poke at a clone:'
   store
   wcache
 
-Should be empty:
+Should be empty (except for the "basic" requires):
 
   $ ls .hg/store
+  requires
 
   $ cd ..

tests/test-fncache.t

@@ -153,6 +153,7 b' Non fncache repo:'
   .hg/store/data/tst.d.hg
   .hg/store/data/tst.d.hg/_foo.i
   .hg/store/phaseroots
+  .hg/store/requires
   .hg/store/undo
   .hg/store/undo.backupfiles
   .hg/store/undo.phaseroots

tests/test-hardlinks.t

@@ -52,6 +52,7 b' Prepare repo r1:'
   1 r1/.hg/store/data/f1.i
   1 r1/.hg/store/fncache (repofncache !)
   1 r1/.hg/store/phaseroots
+  1 r1/.hg/store/requires
   1 r1/.hg/store/undo
   1 r1/.hg/store/undo.backup.fncache (repofncache !)
   1 r1/.hg/store/undo.backupfiles
@@ -93,6 +94,7 b' Repos r1 and r2 should now contain hardl'
   2 r1/.hg/store/data/f1.i
   1 r1/.hg/store/fncache (repofncache !)
   1 r1/.hg/store/phaseroots
+  1 r1/.hg/store/requires
   1 r1/.hg/store/undo
   1 r1/.hg/store/undo.backup.fncache (repofncache !)
   1 r1/.hg/store/undo.backupfiles
@@ -104,6 +106,7 b' Repos r1 and r2 should now contain hardl'
   2 r2/.hg/store/data/d1/f2.i
   2 r2/.hg/store/data/f1.i
   1 r2/.hg/store/fncache (repofncache !)
+  1 r2/.hg/store/requires
 
 Repo r3 should not be hardlinked:
 
@@ -114,6 +117,7 b' Repo r3 should not be hardlinked:'
   1 r3/.hg/store/data/f1.i
   1 r3/.hg/store/fncache (repofncache !)
   1 r3/.hg/store/phaseroots
+  1 r3/.hg/store/requires
   1 r3/.hg/store/undo
   1 r3/.hg/store/undo.backupfiles
   1 r3/.hg/store/undo.phaseroots
@@ -140,6 +144,7 b' Create a non-inlined filelog in r3:'
   1 r3/.hg/store/data/f1.i
   1 r3/.hg/store/fncache (repofncache !)
   1 r3/.hg/store/phaseroots
+  1 r3/.hg/store/requires
   1 r3/.hg/store/undo
   1 r3/.hg/store/undo.backup.fncache (repofncache !)
   1 r3/.hg/store/undo.backup.phaseroots
@@ -172,6 +177,7 b' Push to repo r1 should break up most har'
   1 r2/.hg/store/data/d1/f2.i
   2 r2/.hg/store/data/f1.i
   [12] r2/\.hg/store/fncache (re) (repofncache !)
+  1 r2/.hg/store/requires
 
 #if hardlink-whitelisted repofncache
   $ nlinksdir r2/.hg/store/fncache
@@ -202,6 +208,7 b' Committing a change to f1 in r1 must bre'
   1 r2/.hg/store/data/d1/f2.i
   1 r2/.hg/store/data/f1.i
   1 r2/.hg/store/fncache (repofncache !)
+  1 r2/.hg/store/requires
 
 #if hardlink-whitelisted repofncache
   $ nlinksdir r2/.hg/store/fncache
@@ -261,6 +268,7 b' r4 has hardlinks in the working dir (not'
   2 r4/.hg/store/data/f3.i
   2 r4/.hg/store/fncache (repofncache !)
   2 r4/.hg/store/phaseroots
+  2 r4/.hg/store/requires
   2 r4/.hg/store/undo
   2 r4/.hg/store/undo.backup.fncache (repofncache !)
   2 r4/.hg/store/undo.backup.phaseroots
@@ -318,6 +326,7 b' Update back to revision 12 in r4 should '
   2 r4/.hg/store/data/f3.i
   2 r4/.hg/store/fncache
   2 r4/.hg/store/phaseroots
+  2 r4/.hg/store/requires
   2 r4/.hg/store/undo
   2 r4/.hg/store/undo.backup.fncache (repofncache !)
   2 r4/.hg/store/undo.backup.phaseroots

tests/test-hook.t

@@ -464,6 +464,7 b' more there after'
   fncache (repofncache !)
   journal.phaseroots
   phaseroots
+  requires
   undo
   undo.backup.fncache (repofncache !)
   undo.backupfiles

tests/test-inherit-mode.t

@@ -54,6 +54,7 b' store is setgid'
   00770 ./.hg/cache/
   00600 ./.hg/requires
   00770 ./.hg/store/
+  00600 ./.hg/store/requires
   00770 ./.hg/wcache/
 
   $ mkdir dir
@@ -92,6 +93,7 b' new directories are setgid'
   00660 ./.hg/store/data/foo/index (reposimplestore !)
   00660 ./.hg/store/fncache (repofncache !)
   00660 ./.hg/store/phaseroots
+  00600 ./.hg/store/requires
   00660 ./.hg/store/undo
   00660 ./.hg/store/undo.backupfiles
   00660 ./.hg/store/undo.phaseroots
@@ -121,6 +123,7 b' group can write everything'
   00770 ../push/.hg/cache/
   00660 ../push/.hg/requires
   00770 ../push/.hg/store/
+  00660 ../push/.hg/store/requires
   00770 ../push/.hg/wcache/
 
   $ umask 077
@@ -152,6 +155,7 b' group can still write everything'
   00660 ../push/.hg/store/data/foo/b80de5d138758541c5f05265ad144ab9fa86d1db (reposimplestore !)
   00660 ../push/.hg/store/data/foo/index (reposimplestore !)
   00660 ../push/.hg/store/fncache (repofncache !)
+  00660 ../push/.hg/store/requires
   00660 ../push/.hg/store/undo
   00660 ../push/.hg/store/undo.backupfiles
   00660 ../push/.hg/store/undo.phaseroots

tests/test-init.t

@@ -25,6 +25,7 b" creating 'local'"
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
   testonly-simplestore (reposimplestore !)
@@ -80,6 +81,7 b' creating repo with format.usefncache=fal'
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
   testonly-simplestore (reposimplestore !)
@@ -96,6 +98,7 b' creating repo with format.dotencode=fals'
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
   testonly-simplestore (reposimplestore !)
@@ -112,6 +115,7 b' creating repo with format.dotencode=fals'
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   store
   testonly-simplestore (reposimplestore !)
 
@@ -232,6 +236,7 b" creating 'local/sub/repo'"
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
   testonly-simplestore (reposimplestore !)
@@ -255,6 +260,7 b' init should (for consistency with clone)'
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
   testonly-simplestore (reposimplestore !)
@@ -274,6 +280,7 b' verify that clone also expand urls'
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
   testonly-simplestore (reposimplestore !)

tests/test-lfconvert.t

@@ -103,6 +103,7 b' Test link+rename largefile codepath'
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
   testonly-simplestore (reposimplestore !)

tests/test-narrow-clone-no-ellipsis.t

@@ -30,6 +30,7 b' narrow clone a file, f10'
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
   testonly-simplestore (reposimplestore !)

tests/test-narrow-clone-stream.t

@@ -72,6 +72,7 b' Making sure we have the correct set of r'
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
   treemanifest (tree !)
@@ -86,6 +87,7 b' Making sure store has the required files'
   fncache (flat-fncache !)
   meta (tree !)
   narrowspec
+  requires
   undo
   undo.backupfiles
   undo.narrowspec

tests/test-narrow-clone.t

@@ -46,6 +46,7 b' narrow clone a file, f10'
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
   testonly-simplestore (reposimplestore !)

tests/test-narrow-sparse.t

@@ -65,6 +65,7 b' XXX: we should have a flag in `hg debugs'
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
   treemanifest (tree !)

tests/test-persistent-nodemap.t

@@ -784,7 +784,7 b' downgrading'
   dirstate-v2:         no     no      no
   dotencode:          yes    yes     yes
   generaldelta:       yes    yes     yes
-  share-safe:         yes    yes      no
+  share-safe:         yes    yes     yes
   sparserevlog:       yes    yes     yes
   persistent-nodemap: yes     no      no
   copies-sdc:          no     no      no
@@ -828,7 +828,7 b' upgrading'
   dirstate-v2:         no     no      no
   dotencode:          yes    yes     yes
   generaldelta:       yes    yes     yes
-  share-safe:         yes    yes      no
+  share-safe:         yes    yes     yes
   sparserevlog:       yes    yes     yes
   persistent-nodemap:  no    yes      no
   copies-sdc:          no     no      no

tests/test-remotefilelog-clone-tree.t

@@ -34,6 +34,7 b''
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
   treemanifest
@@ -78,6 +79,7 b''
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
   treemanifest
@@ -122,6 +124,7 b''
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
   treemanifest

tests/test-remotefilelog-clone.t

@@ -31,6 +31,7 b''
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
 
@@ -68,6 +69,7 b''
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
   $ ls .hg/store/data
@@ -120,5 +122,6 b' check its contents separately.'
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store

tests/test-remotefilelog-log.t

@@ -34,6 +34,7 b' Shallow clone from full'
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
 

tests/test-requires.t

@@ -57,6 +57,7 b' another repository of push/pull/clone on'
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
   $ hg -R supported status

tests/test-rhg.t

@@ -243,6 +243,7 b' Requirements'
   persistent-nodemap
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
 

tests/test-sparse-requirement.t

@@ -24,6 +24,7 b' Enable sparse profile'
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
   testonly-simplestore (reposimplestore !)
@@ -45,6 +46,7 b' Requirement for sparse added when sparse'
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
   testonly-simplestore (reposimplestore !)
@@ -67,6 +69,7 b' Requirement for sparse is removed when s'
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
   testonly-simplestore (reposimplestore !)

tests/test-sqlitestore.t

@@ -21,6 +21,7 b' New repo should not use SQLite by defaul'
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
 
@@ -38,6 +39,7 b' storage.new-repo-backend=sqlite is recog'
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
 
@@ -59,6 +61,7 b' Can force compression to zlib'
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
 
@@ -75,6 +78,7 b' Can force compression to none'
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
 

tests/test-static-http.t

@@ -240,6 +240,7 b' List of files accessed over HTTP:'
   /.hg/store/data/a.i
   /.hg/store/data/~2ehgsub.i (py37 !)
   /.hg/store/data/~2ehgsubstate.i (py37 !)
+  /.hg/store/requires
   /notarepo/.hg/00changelog.i
   /notarepo/.hg/requires
   /remote-with-names/.hg/bookmarks
@@ -255,6 +256,7 b' List of files accessed over HTTP:'
   /remote-with-names/.hg/store/data/%7E2ehgtags.i (no-py37 !)
   /remote-with-names/.hg/store/data/foo.i
   /remote-with-names/.hg/store/data/~2ehgtags.i (py37 !)
+  /remote-with-names/.hg/store/requires
   /remote/.hg/bookmarks
   /remote/.hg/bookmarks.current
   /remote/.hg/cache/branch2-base
@@ -274,12 +276,14 b' List of files accessed over HTTP:'
   /remote/.hg/store/data/quux.i
   /remote/.hg/store/data/~2edotfile%20with%20spaces.i (py37 !)
   /remote/.hg/store/data/~2ehgtags.i (py37 !)
+  /remote/.hg/store/requires
   /remotempty/.hg/bookmarks
   /remotempty/.hg/bookmarks.current
   /remotempty/.hg/dirstate
   /remotempty/.hg/requires
   /remotempty/.hg/store/00changelog.i
   /remotempty/.hg/store/00manifest.i
+  /remotempty/.hg/store/requires
   /sub/.hg/bookmarks
   /sub/.hg/bookmarks.current
   /sub/.hg/cache/hgtagsfnodes1
@@ -290,3 +294,4 b' List of files accessed over HTTP:'
   /sub/.hg/store/data/%7E2ehgtags.i (no-py37 !)
   /sub/.hg/store/data/test.i
   /sub/.hg/store/data/~2ehgtags.i (py37 !)
+  /sub/.hg/store/requires

tests/test-upgrade-repo.t

@@ -60,7 +60,7 b' An upgrade of a repository created with '
   dirstate-v2:         no
   dotencode:          yes
   generaldelta:       yes
-  share-safe:          no
+  share-safe:         yes
   sparserevlog:       yes
   persistent-nodemap:  no (no-rust !)
   persistent-nodemap: yes (rust !)
@@ -76,7 +76,7 b' An upgrade of a repository created with '
   dirstate-v2:         no     no      no
   dotencode:          yes    yes     yes
   generaldelta:       yes    yes     yes
-  share-safe:          no     no      no
+  share-safe:         yes    yes     yes
   sparserevlog:       yes    yes     yes
   persistent-nodemap:  no     no      no (no-rust !)
   persistent-nodemap: yes    yes      no (rust !)
@@ -93,7 +93,7 b' An upgrade of a repository created with '
   dirstate-v2:         no     no      no
   dotencode:          yes     no     yes
   generaldelta:       yes    yes     yes
-  share-safe:          no     no      no
+  share-safe:         yes    yes     yes
   sparserevlog:       yes    yes     yes
   persistent-nodemap:  no     no      no (no-rust !)
   persistent-nodemap: yes    yes      no (rust !)
@@ -110,7 +110,7 b' An upgrade of a repository created with '
   [formatvariant.name.uptodate|dirstate-v2:       ][formatvariant.repo.uptodate|  no][formatvariant.config.default|     no][formatvariant.default|      no]
   [formatvariant.name.mismatchconfig|dotencode:         ][formatvariant.repo.mismatchconfig| yes][formatvariant.config.special|     no][formatvariant.default|     yes]
   [formatvariant.name.uptodate|generaldelta:      ][formatvariant.repo.uptodate| yes][formatvariant.config.default|    yes][formatvariant.default|     yes]
-  [formatvariant.name.uptodate|share-safe:        ][formatvariant.repo.uptodate|  no][formatvariant.config.default|     no][formatvariant.default|      no]
+  [formatvariant.name.uptodate|share-safe:        ][formatvariant.repo.uptodate| yes][formatvariant.config.default|    yes][formatvariant.default|     yes]
   [formatvariant.name.uptodate|sparserevlog:      ][formatvariant.repo.uptodate| yes][formatvariant.config.default|    yes][formatvariant.default|     yes]
   [formatvariant.name.uptodate|persistent-nodemap:][formatvariant.repo.uptodate|  no][formatvariant.config.default|     no][formatvariant.default|      no] (no-rust !)
   [formatvariant.name.mismatchdefault|persistent-nodemap:][formatvariant.repo.mismatchdefault| yes][formatvariant.config.special|    yes][formatvariant.default|      no] (rust !)
@@ -148,10 +148,10 b' An upgrade of a repository created with '
     "repo": true
    },
    {
-    "config": false,
-    "default": false,
+    "config": true,
+    "default": true,
     "name": "share-safe",
-    "repo": false
+    "repo": true
    },
    {
     "config": true,
@@ -210,8 +210,8 b' An upgrade of a repository created with '
   performing an upgrade with "--run" will make the following changes:
   
   requirements
-     preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, sparserevlog, store (rust !)
+     preserved: dotencode, fncache, generaldelta, revlogv1, share-safe, sparserevlog, store (no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, share-safe, sparserevlog, store (rust !)
   
   no revlogs to process
   
@@ -232,8 +232,8 b' An upgrade of a repository created with '
 
   $ hg debugupgraderepo --quiet
   requirements
-     preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, sparserevlog, store (rust !)
+     preserved: dotencode, fncache, generaldelta, revlogv1, share-safe, sparserevlog, store (no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, share-safe, sparserevlog, store (rust !)
   
   no revlogs to process
   
@@ -245,8 +245,8 b' An upgrade of a repository created with '
   performing an upgrade with "--run" will make the following changes:
   
   requirements
-     preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, sparserevlog, store (rust !)
+     preserved: dotencode, fncache, generaldelta, revlogv1, share-safe, sparserevlog, store (no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, share-safe, sparserevlog, store (rust !)
   
   optimisations: re-delta-parent
   
@@ -277,8 +277,8 b' modern form of the option'
   performing an upgrade with "--run" will make the following changes:
   
   requirements
-     preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, sparserevlog, store (rust !)
+     preserved: dotencode, fncache, generaldelta, revlogv1, share-safe, sparserevlog, store (no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, share-safe, sparserevlog, store (rust !)
   
   optimisations: re-delta-parent
   
@@ -303,8 +303,8 b' modern form of the option'
   
   $ hg debugupgrade --optimize re-delta-parent --quiet
   requirements
-     preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, sparserevlog, store (rust !)
+     preserved: dotencode, fncache, generaldelta, revlogv1, share-safe, sparserevlog, store (no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, share-safe, sparserevlog, store (rust !)
   
   optimisations: re-delta-parent
   
@@ -349,7 +349,7 b' Various sub-optimal detections work'
   dirstate-v2:         no     no      no
   dotencode:           no    yes     yes
   generaldelta:        no    yes     yes
-  share-safe:          no     no      no
+  share-safe:          no    yes     yes
   sparserevlog:        no    yes     yes
   persistent-nodemap:  no     no      no (no-rust !)
   persistent-nodemap:  no    yes      no (rust !)
@@ -366,7 +366,7 b' Various sub-optimal detections work'
   dirstate-v2:         no     no      no
   dotencode:           no    yes     yes
   generaldelta:        no     no     yes
-  share-safe:          no     no      no
+  share-safe:          no    yes     yes
   sparserevlog:        no     no     yes
   persistent-nodemap:  no     no      no (no-rust !)
   persistent-nodemap:  no    yes      no (rust !)
@@ -383,7 +383,7 b' Various sub-optimal detections work'
   [formatvariant.name.uptodate|dirstate-v2:       ][formatvariant.repo.uptodate|  no][formatvariant.config.default|     no][formatvariant.default|      no]
   [formatvariant.name.mismatchconfig|dotencode:         ][formatvariant.repo.mismatchconfig|  no][formatvariant.config.default|    yes][formatvariant.default|     yes]
   [formatvariant.name.mismatchdefault|generaldelta:      ][formatvariant.repo.mismatchdefault|  no][formatvariant.config.special|     no][formatvariant.default|     yes]
-  [formatvariant.name.uptodate|share-safe:        ][formatvariant.repo.uptodate|  no][formatvariant.config.default|     no][formatvariant.default|      no]
+  [formatvariant.name.mismatchconfig|share-safe:        ][formatvariant.repo.mismatchconfig|  no][formatvariant.config.default|    yes][formatvariant.default|     yes]
   [formatvariant.name.mismatchdefault|sparserevlog:      ][formatvariant.repo.mismatchdefault|  no][formatvariant.config.special|     no][formatvariant.default|     yes]
   [formatvariant.name.uptodate|persistent-nodemap:][formatvariant.repo.uptodate|  no][formatvariant.config.default|     no][formatvariant.default|      no] (no-rust !)
   [formatvariant.name.mismatchconfig|persistent-nodemap:][formatvariant.repo.mismatchconfig|  no][formatvariant.config.special|    yes][formatvariant.default|      no] (rust !)
@@ -410,6 +410,9 b' Various sub-optimal detections work'
   generaldelta
      deltas within internal storage are unable to choose optimal revisions; repository is larger and slower than it could be; interaction with other repositories may require extra network and CPU resources, making "hg push" and "hg pull" slower
   
+  share-safe
+     old shared repositories do not share source repository requirements and config. This leads to various problems when the source repository format is upgraded or some new extensions are enabled.
+  
   sparserevlog
      in order to limit disk reading and memory usage on older version, the span of a delta chain from its root to its end is limited, whatever the relevant data in this span. This can severly limit Mercurial ability to build good chain of delta resulting is much more storage space being taken and limit reusability of on disk delta during exchange.
   
@@ -421,8 +424,8 b' Various sub-optimal detections work'
   
   requirements
      preserved: revlogv1, store
-     added: dotencode, fncache, generaldelta, sparserevlog (no-rust !)
-     added: dotencode, fncache, generaldelta, persistent-nodemap, sparserevlog (rust !)
+     added: dotencode, fncache, generaldelta, share-safe, sparserevlog (no-rust !)
+     added: dotencode, fncache, generaldelta, persistent-nodemap, share-safe, sparserevlog (rust !)
   
   fncache
      repository will be more resilient to storing certain paths and performance of certain operations should be improved
@@ -433,6 +436,9 b' Various sub-optimal detections work'
   generaldelta
      repository storage will be able to create optimal deltas; new repository data will be smaller and read times should decrease; interacting with other repositories using this storage model should require less network and CPU resources, making "hg push" and "hg pull" faster
   
+  share-safe
+     Upgrades a repository to share-safe format so that future shares of this repository share its requirements and configs.
+  
   sparserevlog
      Revlog supports delta chain with more unused data between payload. These gaps will be skipped at read time. This allows for better delta chains, making a better compression and faster exchange with server.
   
@@ -461,8 +467,8 b' Various sub-optimal detections work'
   $ hg debugupgraderepo --quiet
   requirements
      preserved: revlogv1, store
-     added: dotencode, fncache, generaldelta, sparserevlog (no-rust !)
-     added: dotencode, fncache, generaldelta, persistent-nodemap, sparserevlog (rust !)
+     added: dotencode, fncache, generaldelta, share-safe, sparserevlog (no-rust !)
+     added: dotencode, fncache, generaldelta, persistent-nodemap, share-safe, sparserevlog (rust !)
   
   processed revlogs:
     - all-filelogs
@@ -483,6 +489,9 b' Various sub-optimal detections work'
   generaldelta
      deltas within internal storage are unable to choose optimal revisions; repository is larger and slower than it could be; interaction with other repositories may require extra network and CPU resources, making "hg push" and "hg pull" slower
   
+  share-safe
+     old shared repositories do not share source repository requirements and config. This leads to various problems when the source repository format is upgraded or some new extensions are enabled.
+  
   sparserevlog
      in order to limit disk reading and memory usage on older version, the span of a delta chain from its root to its end is limited, whatever the relevant data in this span. This can severly limit Mercurial ability to build good chain of delta resulting is much more storage space being taken and limit reusability of on disk delta during exchange.
   
@@ -499,8 +508,8 b' Various sub-optimal detections work'
   
   requirements
      preserved: revlogv1, store
-     added: fncache, generaldelta, sparserevlog (no-rust !)
-     added: fncache, generaldelta, persistent-nodemap, sparserevlog (rust !)
+     added: fncache, generaldelta, share-safe, sparserevlog (no-rust !)
+     added: fncache, generaldelta, persistent-nodemap, share-safe, sparserevlog (rust !)
   
   fncache
      repository will be more resilient to storing certain paths and performance of certain operations should be improved
@@ -508,6 +517,9 b' Various sub-optimal detections work'
   generaldelta
      repository storage will be able to create optimal deltas; new repository data will be smaller and read times should decrease; interacting with other repositories using this storage model should require less network and CPU resources, making "hg push" and "hg pull" faster
   
+  share-safe
+     Upgrades a repository to share-safe format so that future shares of this repository share its requirements and configs.
+  
   sparserevlog
      Revlog supports delta chain with more unused data between payload. These gaps will be skipped at read time. This allows for better delta chains, making a better compression and faster exchange with server.
   
@@ -576,8 +588,8 b' make sure we have a .d file'
   upgrade will perform the following actions:
   
   requirements
-     preserved: dotencode, fncache, revlogv1, store (no-rust !)
-     preserved: dotencode, fncache, persistent-nodemap, revlogv1, store (rust !)
+     preserved: dotencode, fncache, revlogv1, share-safe, store (no-rust !)
+     preserved: dotencode, fncache, persistent-nodemap, revlogv1, share-safe, store (rust !)
      added: generaldelta
   
   generaldelta
@@ -602,6 +614,7 b' make sure we have a .d file'
   finished migrating 3 changelog revisions; change in size: 0 bytes
   finished migrating 9 total revisions; total change in store size: -17 bytes
   copying phaseroots
+  copying requires
   data fully upgraded in a temporary repository
   marking source repository as being upgraded; clients will be unable to read from repository
   starting in-place swap of repository data
@@ -616,11 +629,14 b' make sure we have a .d file'
 Original requirements backed up
 
   $ cat .hg/upgradebackup.*/requires
+  share-safe
+  $ cat .hg/upgradebackup.*/store/requires
   dotencode
   fncache
   persistent-nodemap (rust !)
   revlogv1
   store
+  upgradeinprogress
 
 generaldelta added to original requirements files
 
@@ -630,6 +646,7 b' generaldelta added to original requireme'
   generaldelta
   persistent-nodemap (rust !)
   revlogv1
+  share-safe
   store
 
 store directory has files we expect
@@ -640,6 +657,7 b' store directory has files we expect'
   data
   fncache
   phaseroots
+  requires
   undo
   undo.backupfiles
   undo.phaseroots
@@ -668,6 +686,7 b' old store should be backed up'
   data
   fncache
   phaseroots
+  requires
   undo
   undo.backup.fncache
   undo.backupfiles
@@ -684,8 +703,8 b' unless --no-backup is passed'
   upgrade will perform the following actions:
   
   requirements
-     preserved: dotencode, fncache, generaldelta, revlogv1, store (no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, store (rust !)
+     preserved: dotencode, fncache, generaldelta, revlogv1, share-safe, store (no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, share-safe, store (rust !)
      added: sparserevlog
   
   sparserevlog
@@ -710,6 +729,7 b' unless --no-backup is passed'
   finished migrating 3 changelog revisions; change in size: 0 bytes
   finished migrating 9 total revisions; total change in store size: 0 bytes
   copying phaseroots
+  copying requires
   data fully upgraded in a temporary repository
   marking source repository as being upgraded; clients will be unable to read from repository
   starting in-place swap of repository data
@@ -726,8 +746,8 b' We can restrict optimization to some rev'
   upgrade will perform the following actions:
   
   requirements
-     preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, sparserevlog, store (rust !)
+     preserved: dotencode, fncache, generaldelta, revlogv1, share-safe, sparserevlog, store (no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, share-safe, sparserevlog, store (rust !)
   
   optimisations: re-delta-parent
   
@@ -756,6 +776,7 b' We can restrict optimization to some rev'
   finished migrating 3 changelog revisions; change in size: 0 bytes
   finished migrating 9 total revisions; total change in store size: 0 bytes
   copying phaseroots
+  copying requires
   data fully upgraded in a temporary repository
   marking source repository as being upgraded; clients will be unable to read from repository
   starting in-place swap of repository data
@@ -804,8 +825,8 b' Check we can select negatively'
   upgrade will perform the following actions:
   
   requirements
-     preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, sparserevlog, store (rust !)
+     preserved: dotencode, fncache, generaldelta, revlogv1, share-safe, sparserevlog, store (no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, share-safe, sparserevlog, store (rust !)
   
   optimisations: re-delta-parent
   
@@ -835,6 +856,7 b' Check we can select negatively'
   finished migrating 3 changelog revisions; change in size: 0 bytes
   finished migrating 9 total revisions; total change in store size: 0 bytes
   copying phaseroots
+  copying requires
   data fully upgraded in a temporary repository
   marking source repository as being upgraded; clients will be unable to read from repository
   starting in-place swap of repository data
@@ -855,8 +877,8 b' Check that we can select changelog only'
   upgrade will perform the following actions:
   
   requirements
-     preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, sparserevlog, store (rust !)
+     preserved: dotencode, fncache, generaldelta, revlogv1, share-safe, sparserevlog, store (no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, share-safe, sparserevlog, store (rust !)
   
   optimisations: re-delta-parent
   
@@ -885,6 +907,7 b' Check that we can select changelog only'
   finished migrating 3 changelog revisions; change in size: 0 bytes
   finished migrating 9 total revisions; total change in store size: 0 bytes
   copying phaseroots
+  copying requires
   data fully upgraded in a temporary repository
   marking source repository as being upgraded; clients will be unable to read from repository
   starting in-place swap of repository data
@@ -905,8 +928,8 b' Check that we can select filelog only'
   upgrade will perform the following actions:
   
   requirements
-     preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, sparserevlog, store (rust !)
+     preserved: dotencode, fncache, generaldelta, revlogv1, share-safe, sparserevlog, store (no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, share-safe, sparserevlog, store (rust !)
   
   optimisations: re-delta-parent
   
@@ -935,6 +958,7 b' Check that we can select filelog only'
   finished migrating 3 changelog revisions; change in size: 0 bytes
   finished migrating 9 total revisions; total change in store size: 0 bytes
   copying phaseroots
+  copying requires
   data fully upgraded in a temporary repository
   marking source repository as being upgraded; clients will be unable to read from repository
   starting in-place swap of repository data
@@ -958,8 +982,8 b" Check you can't skip revlog clone during"
   warning: ignoring  --no-manifest, as upgrade is changing: sparserevlog
   
   requirements
-     preserved: dotencode, fncache, generaldelta, revlogv1, store (no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, store (rust !)
+     preserved: dotencode, fncache, generaldelta, revlogv1, share-safe, store (no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, share-safe, store (rust !)
      removed: sparserevlog
   
   optimisations: re-delta-parent
@@ -976,8 +1000,8 b" Check you can't skip revlog clone during"
   upgrade will perform the following actions:
   
   requirements
-     preserved: dotencode, fncache, generaldelta, revlogv1, store (no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, store (rust !)
+     preserved: dotencode, fncache, generaldelta, revlogv1, share-safe, store (no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, share-safe, store (rust !)
      removed: sparserevlog
   
   optimisations: re-delta-parent
@@ -1009,6 +1033,7 b" Check you can't skip revlog clone during"
   finished migrating 3 changelog revisions; change in size: 0 bytes
   finished migrating 9 total revisions; total change in store size: 0 bytes
   copying phaseroots
+  copying requires
   data fully upgraded in a temporary repository
   marking source repository as being upgraded; clients will be unable to read from repository
   starting in-place swap of repository data
@@ -1033,8 +1058,8 b" Check you can't skip revlog clone during"
   upgrade will perform the following actions:
   
   requirements
-     preserved: dotencode, fncache, generaldelta, revlogv1, store (no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, store (rust !)
+     preserved: dotencode, fncache, generaldelta, revlogv1, share-safe, store (no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, share-safe, store (rust !)
      added: sparserevlog
   
   optimisations: re-delta-parent
@@ -1069,6 +1094,7 b" Check you can't skip revlog clone during"
   finished migrating 3 changelog revisions; change in size: 0 bytes
   finished migrating 9 total revisions; total change in store size: 0 bytes
   copying phaseroots
+  copying requires
   data fully upgraded in a temporary repository
   marking source repository as being upgraded; clients will be unable to read from repository
   starting in-place swap of repository data
@@ -1099,8 +1125,8 b" store files with special filenames aren'"
   upgrade will perform the following actions:
   
   requirements
-     preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, sparserevlog, store (rust !)
+     preserved: dotencode, fncache, generaldelta, revlogv1, share-safe, sparserevlog, store (no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, share-safe, sparserevlog, store (rust !)
   
   optimisations: re-delta-fulladd
   
@@ -1127,6 +1153,7 b" store files with special filenames aren'"
   finished migrating 3 total revisions; total change in store size: 0 bytes
   copying .XX_special_filename
   copying phaseroots
+  copying requires
   data fully upgraded in a temporary repository
   marking source repository as being upgraded; clients will be unable to read from repository
   starting in-place swap of repository data
@@ -1165,6 +1192,7 b' Check upgrading a large file repository'
   largefiles
   persistent-nodemap (rust !)
   revlogv1
+  share-safe
   sparserevlog
   store
 
@@ -1177,6 +1205,7 b' Check upgrading a large file repository'
   largefiles
   persistent-nodemap (rust !)
   revlogv1
+  share-safe
   sparserevlog
   store
 
@@ -1265,8 +1294,8 b' repository config is taken in account'
   upgrade will perform the following actions:
   
   requirements
-     preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, sparserevlog, store (rust !)
+     preserved: dotencode, fncache, generaldelta, revlogv1, share-safe, sparserevlog, store (no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, share-safe, sparserevlog, store (rust !)
   
   optimisations: re-delta-all
   
@@ -1292,6 +1321,7 b' repository config is taken in account'
   finished migrating 3 changelog revisions; change in size: 0 bytes
   finished migrating 9 total revisions; total change in store size: -9 bytes
   copying phaseroots
+  copying requires
   data fully upgraded in a temporary repository
   marking source repository as being upgraded; clients will be unable to read from repository
   starting in-place swap of repository data
@@ -1328,6 +1358,7 b' Check upgrading a sparse-revlog reposito'
   generaldelta
   persistent-nodemap (rust !)
   revlogv1
+  share-safe
   store
 
 Check that we can add the sparse-revlog format requirement
@@ -1335,8 +1366,8 b' Check that we can add the sparse-revlog '
   upgrade will perform the following actions:
   
   requirements
-     preserved: dotencode, fncache, generaldelta, revlogv1, store (no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, store (rust !)
+     preserved: dotencode, fncache, generaldelta, revlogv1, share-safe, store (no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, share-safe, store (rust !)
      added: sparserevlog
   
   processed revlogs:
@@ -1350,6 +1381,7 b' Check that we can add the sparse-revlog '
   generaldelta
   persistent-nodemap (rust !)
   revlogv1
+  share-safe
   sparserevlog
   store
 
@@ -1358,8 +1390,8 b' Check that we can remove the sparse-revl'
   upgrade will perform the following actions:
   
   requirements
-     preserved: dotencode, fncache, generaldelta, revlogv1, store (no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, store (rust !)
+     preserved: dotencode, fncache, generaldelta, revlogv1, share-safe, store (no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, share-safe, store (rust !)
      removed: sparserevlog
   
   processed revlogs:
@@ -1373,6 +1405,7 b' Check that we can remove the sparse-revl'
   generaldelta
   persistent-nodemap (rust !)
   revlogv1
+  share-safe
   store
 
 #if zstd
@@ -1386,8 +1419,8 b' upgrade'
   upgrade will perform the following actions:
   
   requirements
-     preserved: dotencode, fncache, generaldelta, revlogv1, store (no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, store (rust !)
+     preserved: dotencode, fncache, generaldelta, revlogv1, share-safe, store (no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, share-safe, store (rust !)
      added: revlog-compression-zstd, sparserevlog
   
   processed revlogs:
@@ -1401,7 +1434,7 b' upgrade'
   dirstate-v2:         no     no      no
   dotencode:          yes    yes     yes
   generaldelta:       yes    yes     yes
-  share-safe:          no     no      no
+  share-safe:         yes    yes     yes
   sparserevlog:       yes    yes     yes
   persistent-nodemap:  no     no      no (no-rust !)
   persistent-nodemap: yes    yes      no (rust !)
@@ -1419,6 +1452,7 b' upgrade'
   persistent-nodemap (rust !)
   revlog-compression-zstd
   revlogv1
+  share-safe
   sparserevlog
   store
 
@@ -1428,8 +1462,8 b' downgrade'
   upgrade will perform the following actions:
   
   requirements
-     preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, sparserevlog, store (rust !)
+     preserved: dotencode, fncache, generaldelta, revlogv1, share-safe, sparserevlog, store (no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, share-safe, sparserevlog, store (rust !)
      removed: revlog-compression-zstd
   
   processed revlogs:
@@ -1443,7 +1477,7 b' downgrade'
   dirstate-v2:         no     no      no
   dotencode:          yes    yes     yes
   generaldelta:       yes    yes     yes
-  share-safe:          no     no      no
+  share-safe:         yes    yes     yes
   sparserevlog:       yes    yes     yes
   persistent-nodemap:  no     no      no (no-rust !)
   persistent-nodemap: yes    yes      no (rust !)
@@ -1460,6 +1494,7 b' downgrade'
   generaldelta
   persistent-nodemap (rust !)
   revlogv1
+  share-safe
   sparserevlog
   store
 
@@ -1473,8 +1508,8 b' upgrade from hgrc'
   upgrade will perform the following actions:
   
   requirements
-     preserved: dotencode, fncache, generaldelta, revlogv1, sparserevlog, store (no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, sparserevlog, store (rust !)
+     preserved: dotencode, fncache, generaldelta, revlogv1, share-safe, sparserevlog, store (no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlogv1, share-safe, sparserevlog, store (rust !)
      added: revlog-compression-zstd
   
   processed revlogs:
@@ -1488,7 +1523,7 b' upgrade from hgrc'
   dirstate-v2:         no     no      no
   dotencode:          yes    yes     yes
   generaldelta:       yes    yes     yes
-  share-safe:          no     no      no
+  share-safe:         yes    yes     yes
   sparserevlog:       yes    yes     yes
   persistent-nodemap:  no     no      no (no-rust !)
   persistent-nodemap: yes    yes      no (rust !)
@@ -1506,6 +1541,7 b' upgrade from hgrc'
   persistent-nodemap (rust !)
   revlog-compression-zstd
   revlogv1
+  share-safe
   sparserevlog
   store
 
@@ -1521,9 +1557,9 b' upgrade'
   upgrade will perform the following actions:
   
   requirements
-     preserved: dotencode, fncache, generaldelta, store (no-zstd !)
-     preserved: dotencode, fncache, generaldelta, revlog-compression-zstd, sparserevlog, store (zstd no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlog-compression-zstd, sparserevlog, store (rust !)
+     preserved: dotencode, fncache, generaldelta, share-safe, store (no-zstd !)
+     preserved: dotencode, fncache, generaldelta, revlog-compression-zstd, share-safe, sparserevlog, store (zstd no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlog-compression-zstd, share-safe, sparserevlog, store (rust !)
      removed: revlogv1
      added: exp-revlogv2.2 (zstd !)
      added: exp-revlogv2.2, sparserevlog (no-zstd !)
@@ -1539,7 +1575,7 b' upgrade'
   dirstate-v2:         no     no      no
   dotencode:          yes    yes     yes
   generaldelta:       yes    yes     yes
-  share-safe:          no     no      no
+  share-safe:         yes    yes     yes
   sparserevlog:       yes    yes     yes
   persistent-nodemap:  no     no      no (no-rust !)
   persistent-nodemap: yes    yes      no (rust !)
@@ -1557,6 +1593,7 b' upgrade'
   generaldelta
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
+  share-safe
   sparserevlog
   store
   $ hg debugsidedata -c 0
@@ -1570,9 +1607,9 b' downgrade'
   upgrade will perform the following actions:
   
   requirements
-     preserved: dotencode, fncache, generaldelta, sparserevlog, store (no-zstd !)
-     preserved: dotencode, fncache, generaldelta, revlog-compression-zstd, sparserevlog, store (zstd no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlog-compression-zstd, sparserevlog, store (rust !)
+     preserved: dotencode, fncache, generaldelta, share-safe, sparserevlog, store (no-zstd !)
+     preserved: dotencode, fncache, generaldelta, revlog-compression-zstd, share-safe, sparserevlog, store (zstd no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlog-compression-zstd, share-safe, sparserevlog, store (rust !)
      removed: exp-revlogv2.2
      added: revlogv1
   
@@ -1587,7 +1624,7 b' downgrade'
   dirstate-v2:         no     no      no
   dotencode:          yes    yes     yes
   generaldelta:       yes    yes     yes
-  share-safe:          no     no      no
+  share-safe:         yes    yes     yes
   sparserevlog:       yes    yes     yes
   persistent-nodemap:  no     no      no (no-rust !)
   persistent-nodemap: yes    yes      no (rust !)
@@ -1605,6 +1642,7 b' downgrade'
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
   revlogv1
+  share-safe
   sparserevlog
   store
   $ hg debugsidedata -c 0
@@ -1619,9 +1657,9 b' upgrade from hgrc'
   upgrade will perform the following actions:
   
   requirements
-     preserved: dotencode, fncache, generaldelta, sparserevlog, store (no-zstd !)
-     preserved: dotencode, fncache, generaldelta, revlog-compression-zstd, sparserevlog, store (zstd no-rust !)
-     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlog-compression-zstd, sparserevlog, store (rust !)
+     preserved: dotencode, fncache, generaldelta, share-safe, sparserevlog, store (no-zstd !)
+     preserved: dotencode, fncache, generaldelta, revlog-compression-zstd, share-safe, sparserevlog, store (zstd no-rust !)
+     preserved: dotencode, fncache, generaldelta, persistent-nodemap, revlog-compression-zstd, share-safe, sparserevlog, store (rust !)
      removed: revlogv1
      added: exp-revlogv2.2
   
@@ -1636,7 +1674,7 b' upgrade from hgrc'
   dirstate-v2:         no     no      no
   dotencode:          yes    yes     yes
   generaldelta:       yes    yes     yes
-  share-safe:          no     no      no
+  share-safe:         yes    yes     yes
   sparserevlog:       yes    yes     yes
   persistent-nodemap:  no     no      no (no-rust !)
   persistent-nodemap: yes    yes      no (rust !)
@@ -1654,6 +1692,7 b' upgrade from hgrc'
   generaldelta
   persistent-nodemap (rust !)
   revlog-compression-zstd (zstd !)
+  share-safe
   sparserevlog
   store
   $ hg debugsidedata -c 0